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Old 22 June 2011, 05:27   #11
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Country: UK - England
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Originally Posted by 9D280 View Post
You wil llikely find on the SR4 that you'll be a fair few holes "out" on the trim - My Suz was two holes in from "full up / out".
Can I apologise and admit that I don't understand this sorry - am sure that it is just my lack of knowledge - but what is the implication?

Alasdair
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Old 22 June 2011, 11:31   #12
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No worries, I momentarily forgot you haven't even seen it yet! You were taliking about converting to power trim, so I guessed your engine is manual, this is about adjusting the trim manually.

If you have manual trim, there is a long pin somewhere at the bottom of your clamps that has a selection of holes to put it in. It is what the leg etc rests against when it's in the "run" position. the SR4 has a slightly raked transom, so if you have the pin in the "bottom" hole, the engine is trimmed "fully down". Likewise if the pin is in the "top" hole it is as far out as it will go.

Full down will give heavy steering and won't be wonderfully fuel efficient. Full up and the prop will "let go" at the slightest provocation. Somewhere in the middle is the optimum for your boat. Previous owner may have it set up correctly, but alwways worth a wee experiment for your loading & driving style. (previous owner may have had three large friends & their diving kit aboard kind of thing......)

The trick is to move it up hole at a time until the prop starts to let go in fast corners. then drop it back down one. Trim is now as optimal as it's going to get.
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Old 22 June 2011, 12:09   #13
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Quote:
Originally Posted by 9D280 View Post
No worries, I momentarily forgot you haven't even seen it yet! You were taliking about converting to power trim, so I guessed your engine is manual, this is about adjusting the trim manually.

If you have manual trim, there is a long pin somewhere at the bottom of your clamps that has a selection of holes to put it in. It is what the leg etc rests against when it's in the "run" position. the SR4 has a slightly raked transom, so if you have the pin in the "bottom" hole, the engine is trimmed "fully down". Likewise if the pin is in the "top" hole it is as far out as it will go.

Full down will give heavy steering and won't be wonderfully fuel efficient. Full up and the prop will "let go" at the slightest provocation. Somewhere in the middle is the optimum for your boat. Previous owner may have it set up correctly, but alwways worth a wee experiment for your loading & driving style. (previous owner may have had three large friends & their diving kit aboard kind of thing......)

The trick is to move it up hole at a time until the prop starts to let go in fast corners. then drop it back down one. Trim is now as optimal as it's going to get.

Awesome - makes sense - thank you so much for taking the time to explain...


only ribs I have driven have had power trim - so not familiar with this - but will play with it...

Alasdair
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Old 22 June 2011, 17:29   #14
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I still own and use on occasion a 1978 4M Searider... they are bomb proof and easily repairable... epic craft
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Old 23 June 2011, 04:01   #15
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only ribs I have driven have had power trim - so not familiar with this - but will play with it...
Think of it like power trim, but you can't adjust on the move and you get your hands wet while adjusting it!
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Old 23 June 2011, 04:13   #16
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Originally Posted by 9D280 View Post
Think of it like power trim, but you can't adjust on the move and you get your hands wet while adjusting it!
It sounds like the pin I had on my 7hp engine on the thames cruiser - for up or down (nothing inbetween) - used to regularly fall into the river when being adjusted

will play!

Alasdair
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Old 23 June 2011, 04:19   #17
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dont worry about PT, my engine is a 45 hp 1972 penta, dont need PT, just play as mentioned with the "holes" and you will find one that does. welcome to the SR4 club
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Old 23 June 2011, 05:00   #18
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Unless you are doing a lot of beach hopping then I think you will be OK with out PTT, I have it & would not be with out it as my SR4 is used as a taxi to the beach most of it's time! My brother in law dose not have it & fineds it a right pain to have to keep going back to raise the leg!
Have fun & enjoy the summer as peter has said you then have all winter to do any mods!
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Old 23 June 2011, 06:47   #19
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Think its OK without, but on the other hand, You would be surprised how much it changes the handling of the boat when You have PTT. Did Yesterday a 60 nm trip in the 5.4 in pretty nasty chop, half way in following sea and then back. PTT made a huge difference in the comfort and speed.

Weight in the stern and trimmed out worked extremely well in the following seas(only 2 mini stufs ), going back home moved spare fuel to the bow and played with the trim taking bow down, finding the hot spot improved the ride a lot. Can be made manually but but not so fun to do.

But its not something You can't live without so would not spend a fortune for having it on a old setup.
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Old 23 June 2011, 07:14   #20
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Thank you - wise words - but I guess as an intro to ribs I can live without for now - if necessary, will strap a few kids to the bouncy bits and shift them around to trim the boat - gaffer tape should do the job!

Alasdair
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